The structure and function of specialised cells in multicellular organisms are different. Explain why this is possible if they all possess the same genetic information.

Explanation:

1. Cell specialization occurs due to the differential gene expression, it is the process which is responsible for the production of cells with different traits at different positions and at different time. This process changes cells  from simple to more specialized in  both structure as well as in function. This is all due to the differential gene expression where all cells beside containing the same gene, express different genes in different cells.

2. Cell differentiation is very important among almost all multicellular organisms. This process results in the  formation of a complex organism with different types of tissues and cells from a zygote.

well

explanation:

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.